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Stockholders' Equity - RSU Activity (Detail) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Shares, Beginning balance | 2,824,964 | 3,512,286 | 4,553,904
Number of Shares, Granted | 0 | 651,563 | 1,095,750
Number of Shares, Settled | (108,135) | (1,103,582) | (1,812,215)
Number of Shares, Cancelled | (382,503) | (235,303) | (325,153)
Number of Shares, Ending balance | 2,334,326 | 2,824,964 | 3,512,286
Weighted Average Exercise Price Per Share, Beginning balance | $ 4.09 | $ 3.39 | $ 1.34
Weighted Average Exercise Price Per Share, Granted |  | $ 3.63 | $ 8.54
Weighted Average Exercise Price Per Share, Settled | $ 1.27 | $ 0.90 | $ 0.81
Weighted Average Exercise Price Per Share, Cancelled | $ 4.77 | $ 7.26 | $ 6.41
Weighted Average Exercise Price Per Share, Ending balance | $ 4.11 | $ 4.09 | $ 3.39
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Shares, Beginning balance | 692,504 | 515,834 | 300,000
Number of Shares, Granted | 625,139 | 255,000 | 255,835
Number of Shares, Settled | (63,334) | (50,829) |
Number of Shares, Cancelled | (153,006) | (27,501) | (40,001)
Number of Shares, Ending balance | 1,101,303 | 692,504 | 515,834
Weighted Average Exercise Price Per Share, Beginning balance | $ 4.85 | $ 6.30 | $ 5.12
Weighted Average Exercise Price Per Share, Granted | $ 4.83 | $ 3.15 | $ 8.44
Weighted Average Exercise Price Per Share, Settled | $ 4.66 | $ 7.76 |
Weighted Average Exercise Price Per Share, Cancelled | $ 5.03 | $ 11.05 | $ 11.05
Weighted Average Exercise Price Per Share, Ending balance | $ 4.71 | $ 4.85 | $ 6.30

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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